x86, extable: Remove the now-unused __ASM_EX_SEC macros

Nothing should use them anymore; only _ASM_EXTABLE() should ever be
used.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: David Daney <david.daney@cavium.com>
Link: http://lkml.kernel.org/r/CA%2B55aFyijf43qSu3N9nWHEBwaGbb7T2Oq9A=9EyR=Jtyqfq_cQ@mail.gmail.com

arch/x86/include/asm/asm.h

@@ -4,11 +4,9 @@
 #ifdef __ASSEMBLY__
 # define __ASM_FORM(x)	x
 # define __ASM_FORM_COMMA(x) x,
-# define __ASM_EX_SEC	.section __ex_table, "a"
 #else
 # define __ASM_FORM(x)	" " #x " "
 # define __ASM_FORM_COMMA(x) " " #x ","
-# define __ASM_EX_SEC	" .section __ex_table,\"a\"\n"
 #endif
 
 #ifdef CONFIG_X86_32